motley



(ModeL) 8 Sheets-Sheet 1. F. P. MOTLEY.

' SCREW MACHINE.

No. 289,125. Patented Nov. 27, 1883.

@Irtnf 3 Sheets-Sheet 2.

(Model) P. P. MOTLEY. SCREW MACHINE. Y

Patented Nov. 27

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3 Sheets-Sheet 3.

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P. F.- MOTLEY.

SCREW MACHINE.

Patented Nov.

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UNITED STATES PATENT Trice.

' FRANCIS F. MOTLEY, OF SEW HAVEN, GOXNEOTICUT, ASSIGNOR TO nnvvonns co.

, or sans rLAon.

SCREW-MACHINE,

SPECIFICATION forming part of Letters Patent No.289,125, dated November 2'7, 1883.

Application filed May 31,1883. llllodel.)

T0 at whom it may concern:

Beit knownthat L'Fninois F. MorLnY, of New Haven, in the county of New Haven and State of Connecticut, have invented a new Im- I m so, looking toward the mandrel, Fig. 10, a transverse section on line 2 5, looking toward the mandrel.

This invention relates to an improvement in that class of screw-making machines designed for producing what are commonly called ifine-thread or machine screwsthat is to say, screws which are cut in asubstantially solid die, whereby the uniformity of thread necessary for metal work is acquired, and particularly to that class in which the mechanism operates automatically to first run the die onto the blank to thread it, then reverse it and run it off preparatory to the presentation of a new or unthreaded blank, the object of the invention being to give to the die the neoessar'fy lead for it to properly engage the blank, so that the thread cut by the die will be sufiicient to draw the die onto the blank, and also to reverse the rotation of the die at a positive mechanism in connection with the die.

the blank may be any of the common or usual constructions, immaterial to this invention, further than that the blank shall be properly I presented and held' concentric with the revolving screw-cutting die. I

A is theJdriving-shaft, arranged in bearings B,.and towhich power is applied through a pulley, G, or otherwise, to give it a constant rotation in one direction.

D is the mandrel, supported in bearings E, free for rotation, and also for longitudinal movement. At its forward end it carries the screw-cutting die a, and stands in axial line with the blank b'when presented to be out.

works, and into the other, G, a gear, I, on the drivingshaft works through an intermediate gear, K, and so that the one gear, F, turns in one (the forward) direction, while the gear G turns in the opposite direction under theconstant forward direction of the drivingshaft. Between the two gears F G is a clutch-sleeve, L, which, when moved forward, as in Fig. 4, engages the gear F and is free from the gear G; but when moved tothe extreme opposite direction it engages the gear G and is free from the gear F. This clutch-sleeve L is splined to the mandrel in the usual manner for such clutches, and so that the one gear, 'F, engaging the clutch will turn the mandrel forward, and engaged with the gear G will turn the mandrel backward, or an intermediate position will leave the sleeve free from the influence of either gear. I

M is a sliding bar, arranged to move parallel with the mandrel, and from this bar M an arm, N, extends into an annular groove in the clutch-sleeve L, as seen in Fig. 4:, so that as the bar M is moved in either direction it will communicate a corresponding movement to the clutch L. To the bar M a spring, P, is apfrom its engagement with the gear F and into engagement with the gear G; but when the gagement with the gear F a latch, R, pivoted slide, as seen in Fig. 5, and holds the slide in position to turn the screw-cutting die-in the forward or cutting direction.

From the latch R an arm, '1, extends upward, and in the path of a trip, U, extending from a horizontal sliding bar,V. This sliding bar is arranged, preferably, directly over the mandrel, as shown, and to the bar a longitudi- On the mandrel are two loose gears, F and G. Into the one, F, a gear, H, on the driving-shaft plied, the action of which is to draw the clutch slide M is moved to-bring the clutch into enon the frame, engages a shoulder, S, on the that forward or engaged position--that is, in,

' nal movement is communicated, correspondi the mandrel and revolving with it, and which works in a corresponding groove in the under side of the barV, as seen in Fig. 3, and so that as the mandrel passes onto the blank in cutting its thread it draws the trip U toward the arm T of the latch, and when the-trip strikes that arm T it turns the latch, so that it will escape from the shoulder S, as seen in broken lines, Fig. 5, just as the cutting ofthe thread is completed. Instantly upon the escape of the latch R from the shoulder S the spring 1 acts upon the slide M and draws the clutch from the gear F and throws it into engagement with the gear G, which is revolving in the opposite direction, and which opposite revolution is immediately imparted to the mandrel, causing it to revolve in the opposite direction and run back from the blank upon which it has cut the thread. To throw the clutch in the opposite direction and into engagement with the gear F when a new blank shall have been presented, I arrange a shaft, (1, in axial line with the driving-shaft,in'bearings e, which has an intermittent rotation imparted to it from the drivingshaft in the following manner:

Atthe forward end of the drivingshaft is a disk, f. -(S hown enlarged in Fig. 6.) On the corresponding end of the shaft (2 is a disk, 9, which is constructed with an annular groove, h. Through the disk 9, and transversely across the groove h, is a bolt, 1, against which a spring, Z, bears, the tendency of which is to force the bolt toward the disk f,- and when a corresponding recess, m, stands in line with the bolt the spring will force the bolt into the said recess'an d engage the two disks,so that the constant revo lution of the disk f will be imparted to the disk 9 and the shaft which carries it; but when the bolt is withdrawn from engagement with the disk f, then-the shaft d is stationary, while the driving-shaft continues its revolution.

n 0 are two arms of a lever hung upon a pivot, 7', the end of one arm, 02, standing in the groove h of the disk the other extending over the sliding bar V. (Seen enlarged in Fig. 7.) To the arm 0 a spring, t, is applied, the tendency of which is to lift the arm n in'the groove h,- but when the arm n is depressed, as seen in Fig. 7, it rests against a shoulder, u, on the bolt-has seen in Fig. 6, and holds the bolt out of engagement with the disk f. As the mandrel' is advancing and cutting the thread the arm a of this lever rests on a plate, w, on the top of the bar V, as seen in Fig. 7, and there with the disk f, and from the'time of-such engagement of the bolt the disk 9 and its shaft will revolve with the driving-shaft, the bolt passing around with the disk. has escaped and passed from the arm n of the lever, then a cam,- 8, on the disk 9 strikes an arm, 4:, which extends down from the arm 'n to the opposite side of the disk,and forces the said arm downward, drawing with it the arm a into the path of the then advancing bolt, and as the rotation of the disk continues the shoulder u will strike an incline, 5, on that side of the arm n, as seen in Fig. 8, which incline will force the bolt out of engagement with. the disk f, and there hold it until such time .as the lever shall be again released. During the rotation of the shaft d, thus imparted, a cam, 6, on the said shaft d strikes a lever, 7, which extends up from the rock-shaft 8, and from which rock-shaft another arm, 9, extends up into engagement with the bar M, and so that the movement of the rock-shaft by said cam 6 draws the bar M forward and takes theclutchfrom engagement with the gear G and into engagement with the gear F, expands the spring 1?, and brings the latch into engagementto hold the bar M, asbefore described, and as the mandrel starts forward it brings the plate w on the slide'V beneath the arm 0 of the lever, as seen in Fig. 7, and so as to hold that arm, 0, up and the other armm, down into the groove h, and therefore prevent the engage ment of the bolt 1' with the disk f, and from the time of such disengagement of the bolt i until its re-engagement, as before described,

the shaft d remains stationary.

To give a lead to the mandrel, and so that.

the-die will run onto the blank to engage it to such an extent that the screw itself may act as the feed to draw the die onto the blank, a slid ing bar, 10, is arranged beneath or parallel with the bar M. lhis slide extends to the rear and turns at right angles, forming an arm, 11, in rear of the mandrel, as seen in Fig. 4. Y The bar extends forward and. is connected to the upper end of an arm, 12, extending up from a rock-shaft, 13. From this rock-shaft another arm, 14, extends up into the path of a cam, 15. on the shaft (1, and so that when the said shaft (1 rotates, as before described, the cam 15 will turn the rock shaft 13 forward and bring thev arm 11 against the end of the mandrel D and press it forward toward the blank at a rate of movement corresponding to the pitch of the thread, and so that the die in the mandrel will be forced onto the blank and start the thread. Then, just before the rotation of the shaft (1 ceases, the arm 14 escapes from the cam 15, and the bar 10 returns by the action of the spring 20, leaving the mandrel free to run onto the blank under the engagement which it is thus forced to make, the thread which the die cuts being sufficient to draw the die onto the blank. By this construction the backward and. forward movement of the mandrel carry ing the die is made automatic and positivethat is to say, it advances to a certain'prede- After the bolt 1 advance movement of the cutting-die depends upon a spring or other uncertain devices.

Instead of employing the bar V to trip the latch It, which holds the bar M, the disk Y or a collar on the mandrel may operate directly upon the latch without the intervention of the bar V.

1. In a screw-cutting machine substantially I such as described, the combination of a revolving mandrel carrying the screw-cutting die, two gears loose on said mandrel, a drivingshaft carrying corresponding fixed gears, with an intermediate gear between one of the gears on the driving-shaft and, one of the gears on the mandrel, a clutch splined on the mandrel and arranged to engage either of said loose gears thereon, according to the direction the mandrel is to be turned, an auxiliary shaft in axial line with the driving-shaft, and a mechanism, substantially such as described, between said driving-shaft and said auxiliary shaft, whereby at a predetermined time said auxiliary shaft is coupled with or released from the driving-shaft, a sliding bar carrying an arm in connection with the clutch-sleeve on the mandrel, and a cam on said auxiliary shaft arranged to impart longitudinal movement to said sliding bar, to connect the clutch on the mandrel with one of the said loose gears, a latch to engage said bar when the clutch is so engaged, and a spring to throw the clutch out of the engagement so made and into engagement with the other loose gear on the mandrel when the latch which holds the bar shall have been tripped, substantially as described.

2. 'In ascrew-cutting machine substantially such as described, the combination of the mandrel carrying the screw-cutting die, two gears loose on said mandrel, one running in one direction and the other in the opposite direction,

aclutch-sleeve splined to the mandrel between said two gears, a sliding bar carrying an arm in connection with said clutchsleeve, and mechanism for imparting to said sliding bar a positive longitudinal movement in one direction, a latch to engage said bar when so moved, and a collar on the mandrel operating to trip said latch when the cutting of the screw shall have been completed, substantially ,as specified.

3. In ascrew-cutting machine substantially such as described, the combination of the mandrel D, the loose gears F and G thereon, clutch-sleeve L, sliding bar M, arm N, latch R, sliding bar V, dish ing from said bar V, substantially as described. V p 4. In ascrew-cuttingmachine substantially such as described, thecombination of the mandrel carrying the screw-cutting die, and arranged to revolve in opposite directions, a

driving-shaft arranged to so communicate Y, and arm U, extendpower to the said mandrel and auxiliary shaft in axial line with said driving-shaft, disk f on the driving-shaft, corresponding dislng, on said auxiliary shaft, constructed with an annular groove, h, the bolt i, lever a 0, the sliding bar V, in connection with the mandrel, the cam 3 on said auxiliary shaft, arranged to bear upon, anarm, 4, extending from said lever n 0, cam 6, rock-shaft 8, sliding bar M, in connection with said rock-shaft, and also in connection with the clutch-sleeve splined to the mandrel between the said two gears on the mandrel, and a latch,- R, substantially as and for the purpose described.

5. In ascrew-cutting machine substantially such as described, the combination of the mandrel carrying the screw-cutting die, the driving-shaft parallel therewith, and arranged to communicate revolution to said mandrel in either direction, an auxiliary shaft in axial line with the driving-shaft, and mechanism, substantially such as described, to connect said auxiliary shaft with said driving-shaft and release it therefrom at predetermined times, and a cam on the said auxiliary shaft, with mechanism, substantially such as described, between said cam and the wheels on the mandrel,

through which the power is communicated thereto, whereby the rotation of saidmandrel will be reversed at such predetermined times,

substantially as described.

6. In ascrew-cutting machine substantially such as described, the combination of the mandrel carrying the screw-cutting die, two loose gears on said mandrel working in opposite directions, a clutch-sleeve between said gears and splined to the mandrel, a cam operated by the driving-shaft at apredeterminedtime, and mechanism, substantially such as described,between said cam and said clutch, whereby a positive movement is imparted to said clutch in one direction, and a spring to impart movement to the clutch in the opposite direction, substantially as described.

7. In a screw-cutting machine substantially such as described, the combination of the man too IIO

drel carrying the screw-cutting die, two loose -shaft arranged to communicate rotation to said mandrel in opposite directions, an auxiliary shaft inaxial line with said driving-shaft, and mechanism, substantially such as described, to connect said driving-shaft to or disconnect it from said auxiliary shaft at a predetermined time, a cam on said auxiliary shaft, in connection with an arm in rear of said mandrel,

substantially as described, whereby the first advanceof the mandrel carrying the die toward the blank to be cut is forced by said auxiliary shaft and released when the die has engaged the blank, substantially as described.

9. In a screw-cutting machine substantially such as described, the combination of the mandrel carrying the screw-cutting die, the driving-shaft arranged to communicate rotation to said mandrel in opposite directions, an auxiliary shaft in axial line with said drivingshaft, the driving-shaft carryinga disk, f, and the auxiliary shaft a corresponding disk, 9, a sliding bolt, i, in said disk 9, the lever 12 0, sliding bar V, in connection with said man d-rel, whereby said lever on 0 holds the bolt i from engagement with the disk on the drivingshaft until a predeterminedtime, when said bar releases said bolt from said lever and permits engagement of the auxiliary shaft with the driving-shaft, a cam on said auxiliary shaft, and mechanism, substantially such as described, between said cam and the mandrel, whereby said cam advances the mandrel to start the cutting of the blank, substantiallyns described.

10. The combination of the driving-shaft provided with a disk, f, to revolve with it, an

auxiliary shaft arranged in axial line with the the driving-shaft, substantially as described.

FRANCIS Fl MOT-LEY.

' \Vitnesses: I

JOHN E. EARLE, LILLIANVD. KELSEY. 

